[Elecraft] [K2] Cheap power supply for KBT2

[Louandzip]

Although you can certainly use it just for charging an SLA, one advantage of these types of chargers is they automatically go into float mode to maintain the charge and prolong the life of the battery.  This is particularly beneficial for batteries that go fairly long periods of disuse, like motorcycles in the winter, or snow thrower batteries in the summer, etc.
I don't doubt that they can put out RFI, but in chasing down RFI at my QTH, which included switching off the power to the entire home, the ones I use (Battery Tender brand) were never identified as causing me any problems. Of course YMMV. 
   On Wednesday, November 24, 2021, 01:36:53 PM MST, Chris <ve3uvt at gmail.com> wrote:  
 
 Hi Jim,

Excellent article.  I haven't checked if it is a source of noise, but it
doesn't quite matter because this is a charger, not a power supply.  I only
use it when I need to charge a battery, so it is OK.

Best 73,

Chris KM1B


On Wed, Nov 24, 2021 at 2:03 PM Jim Brown <jim at audiosystemsgroup.com> wrote:

> On 11/24/2021 6:29 AM, Chris wrote:
> > I use this, and it seems to be working very well.
>
> Have you checked it for noise, using techniques in this app note?
> http://k9yc.com/KillingReceiveNoise.pdf
>
> Most hams have so much receive noise that they can't hear. If you
> haven't gone through your home to get rid of your own noise sources,
> chances are you're one of them.
>
> 73, Jim K9YC
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